IIS Config

In the admin console for this website, double click on the Url Rewrite option:

Click on the Add Rule(s)... action

Choose the Blank Rule template for an Inbound Rule

Create an Inbound Rule for the parent website (localhost:8080 in this example) with the following settings:

pattern: grafana(/)?(.*)

check the Ignore case checkbox

rewrite url set to http://localhost:3000/{R:2}

check the Append query string checkbox

check the Stop processing of subsequent rules checkbox

Finally, navigate to http://localhost:8080/grafana (replace http://localhost:8080 with your parent domain) and you should come to the Grafana login page.

Troubleshooting

404 error

When navigating to the grafana url (http://localhost:8080/grafana in the example above) and a HTTP Error 404.0 - Not Found error is returned then either:

the pattern for the Inbound Rule is incorrect. Edit the rule, click on the Test pattern... button, test the part of the url after http://localhost:8080/ and make sure it matches. For grafana/login the test should return 3 capture groups: {R:0}: grafana {R:1}: / and {R:2}: login.

The root_url setting in the Grafana config file does not match the parent url with subpath.

Grafana Website only shows text with no images or css

The root_url setting in the Grafana config file does not match the parent url with subpath. This could happen if the root_url is commented out by mistake (; is used for commenting out a line in .ini files):

; root_url = %(protocol)s://%(domain)s/grafana/

or if the subpath in the root_url setting does not match the subpath used in the pattern in the Inbound Rule in IIS:

root_url = %(protocol)s://%(domain)s/grafana/

pattern in Inbound Rule: wrongsubpath(/)?(.*)

or if the Rewrite Url in the Inbound Rule is incorrect.

The Rewrite Url should not include the subpath.

The Rewrite Url should contain the capture group from the pattern matching that returns the part of the url after the subpath. The pattern used above returns 3 capture groups and the third one {R:2} returns the part of the url after http://localhost:8080/grafana/.